Now Farhah mentioned there could be another transformation. I researched to uncover some information. Spoilers for future plot.

It seems the seguinte fairy level will be Mythix. Now websites say this has been confirmed. Though, they said cyberix was too so don't get overly excited for all we know it could be dragonix in honour of Bloom. Mythix seems official due to 11 websites saying so and an official título picture.

The purpose of Mythix is to allow the Winx to enter the Legendarium. It seems the plot line is going to be about shutting off the power of the book, in order to stop any monsters...